Malicious PDF — malware analysis report

Static analysis result for SHA-256 3650a5120df2c2e6…

MALICIOUS

PDF

81.0 KB Created: 2021-03-26 18:51:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf4432bf9cf0754711f6d7a9afa2fc22 SHA-1: 20e50cc9c27bf163a1b8b87371219a2ec45cdd78 SHA-256: 3650a5120df2c2e6bd1cbe6bad1d1b8f7dd2925ee052967f4b09138fa4bf2447
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links to external websites, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a malicious intent to redirect users. While no scripts were explicitly extracted, the presence of external links and the ML classifier's high confidence score point towards a malicious document, likely used as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/123?utm_term=tafep+tripartite+guidelines
    • http://pazadixokumox.sportsontheweb.net/gegubebepole.pdf
    • https://vazipupabevid.weebly.com/uploads/1/3/4/8/134868359/3111027.pdf
    • https://cdn.sqhk.co/vopofuxo/xhgihgG/tolemalutedozoxutus.pdf
    • http://fumuroruzej.medianewsonline.com/nowopax.pdf
    • http://english-10.site/pemarivofanuxudorivosenuzpu1z.pdf
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/talilatu_bubuzibalokime_bobim_pazosogiro.pdf
    • http://lixorajepidil.mygamesonline.org/boy_scout_popcorn_prices_2020.pdf
    • http://trynutra.shop/boy_scouts_camping_merit_badge_covid7evbj.pdf
    • http://podipotekoi.ru/walmart_black_friday_11_4_onlinecatpf.pdf
    • http://ewwe.space/resident_evil_4_ppsspp_zip4qfwy.pdf
    • https://nozukevanof.weebly.com/uploads/1/3/5/3/135392293/a78b3bafa26.pdf
    • https://vataripisak.weebly.com/uploads/1/3/4/6/134600115/bolexeliz.pdf
    • https://givadebar.weebly.com/uploads/1/3/1/4/131437750/kigikomixuwake.pdf
    • https://cdn.sqhk.co/nixafusoda/kYjLheQ/zodotevufiwev.pdf
    • https://fenotitejov.weebly.com/uploads/1/3/5/3/135316040/zowen.pdf
    • http://mapotilij.mygamesonline.org/baby_gap_outlet_online_usa.pdf
    • https://pazudafodimaje.weebly.com/uploads/1/3/0/7/130776249/748478.pdf
    • https://vupolape.weebly.com/uploads/1/3/4/7/134749420/6532513.pdf
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/bunuvuzasiver.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_28dd430c6f684b18967b7333ce4351b3.pdf?index=true
    • https://3c3bf0af-c02c-43ee-ab56-a2e3f1f4987d.filesusr.com/ugd/97f7bb_6823f13e30a946e7bb5c494a66d35f30.pdf?index=true
    • http://judiserod.onlinewebshop.net/dewej.pdf
    • https://ad217471-f301-4d07-b05b-71cdb813ff8b.filesusr.com/ugd/4f915f_48976e5befb146e88033dbbd5a2004b7.pdf?index=true
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_6dab98447cb04e73820a81e2659def5c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1d9.bin
980fc75e4f61a0880f680b2af799e00d6b248a6239c5db907285243b0e192b01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D9 3644 bytes
font_01_sfnt_off0000fedd.bin
34350d64314b349eb8ca2ce3dbaffd55edee456ccc343614ab70bd749eafbcb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDD 5160 bytes
font_02_sfnt_off0001107d.bin
75ecfdde23dc2a8e65586a8f32760ebaca1478889f83f76b297f8ff20d757248		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1107D 10604 bytes

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